Envision: such a powerful word. In 1969 America did something that had only been dreamed of and fantasized about in books and novels—she put a man on the moon. How did this happen? Because John F. Kennedy on May 25, 1961 envisioned putting a man on the moon by the end of the decade.

Nearly a half-century ago, 22,000 acres just south of Orlando, Florida was a swamp where alligators outnumbered people. Porous limestone underlay the vegetal muck. It was land no one wanted until November 22, 1963 when a chartered airplane flew over this huge expanse of muck and mire and a man named Walt Disney pointed to it and said only two words: “That’s it”—and now that region has been transformed into what the entire planet knows as “Disney World” because of what Walt Disney envisioned.

It’s a lesson tha…